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    <p>If you want it to be exactly like PHP 5.3 function, you're gonna need a lot of code. I'd start with something like this:</p> <pre><code>$format = '\Y: Y-m-d'; var_dump($format); $date = date($format); var_dump($date); // reverse engineer date formats $keys = array( 'Y' =&gt; array('year', '\d{4}'), 'm' =&gt; array('month', '\d{2}'), 'd' =&gt; array('day', '\d{2}'), 'j' =&gt; array('day', '\d{1,2}'), 'n' =&gt; array('month', '\d{1,2}'), 'M' =&gt; array('month', '[A-Z][a-z]{2}'), 'F' =&gt; array('month', '[A-Z][a-z]{2,8}'), 'D' =&gt; array('day', '[A-Z][a-z]{2}'), // etc etc etc ); // convert format string to regex $regex = ''; $chars = str_split($format); foreach ( $chars AS $n =&gt; $char ) { $lastChar = isset($chars[$n-1]) ? $chars[$n-1] : ''; $skipCurrent = '\\' == $lastChar; if ( !$skipCurrent &amp;&amp; isset($keys[$char]) ) { $regex .= '(?P&lt;'.$keys[$char][0].'&gt;'.$keys[$char][1].')'; } else if ( '\\' == $char ) { $regex .= $char; } else { $regex .= preg_quote($char); } } var_dump($regex); // now try to match it if ( preg_match('#^'.$regex.'$#', $date, $matches) ) { foreach ( $matches AS $k =&gt; $v ) if ( is_int($k) ) unset($matches[$k]); print_r($matches); } else { echo 'invalid date "'.$date.'" for format "'.$format.'"'."\n"; } </code></pre> <p>Result:</p> <pre><code>string(9) "\Y: Y-m-d" string(13) "Y: 2011-07-12" string(51) "\Y\: (?P&lt;year&gt;\d{4})-(?P&lt;month&gt;\d{2})-(?P&lt;day&gt;\d{2})" Array ( [year] =&gt; 2011 [month] =&gt; 07 [day] =&gt; 12 ) </code></pre> <p>Incomplete and imperfect.</p>
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